Sterre charges $35 to file tax returns, but files for free if she only needs the easiest form. then she donates $2 to clean water projects per tax return she files. sterre charged $7,245 and made a donation of $1,242 this year for the tax returns she filed. sterre returns for free and tax returns for $35 each.

We have been given that Sterre charges $35 to file tax returns, but files for free if she only needs the easiest form. Also, she donates $2 to clean water projects per tax return she files.

Further we know that Sterre charged $7,245 and made a donation of $1,242 this year for the tax returns she filed.

Let x be the number of free income tax returns and y be the number of $35 income tax returns.

Therefore, we can set up:

Since she donates $2 for each return that she files, therefore, we can set up:

Therefore,

Sterre filed 414 tax returns for free and filed 207 tax returns for $35

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